Field soil evaporation limit depth measuring device and measuring method

The invention provides a field soil evaporation limit depth measuring device and method, and relates to the field of environmental science and hydrology experiments, the measuring device comprises a moisture monitoring cylinder, a waterproof cap and a moisture monitoring assembly; the bottom of the moisture monitoring cylinder is closed, the top of the moisture monitoring cylinder is provided with an opening, and the side wall of the moisture monitoring cylinder is provided with a plurality of jacks; the waterproof cap is buckled on the top opening; the moisture monitoring assembly comprises a data collector, a power supply device and a plurality of soil moisture sensors; probes of all the soil moisture sensors penetrate through all the anti-leakage plugs in a one-to-one correspondence mode and are inserted into the cylinders. All the soil moisture sensors are connected with the data collector, and the data collector is connected with the power supply device; the data collector sends soil moisture information